LUBIS, M. Sobron Yamin; SIAHAAN, Erwin; DARMAWAN, Steven; ADIANTO, Adianto; RONALD, Ronald. VARIATION OF CUTTING PARAMETERS IN THE PROCESS OF TURNING AISI 4340 STEEL ON SURFACE ROUGHNESS. SINERGI, Jakarta, Indonesia, v. 23, n. 2, p. 139–144, 2019. DOI: 10.22441/sinergi.2019.2.007. Disponível em: https://publikasi.mercubuana.ac.id/index.php/sinergi/article/view/3407. Acesso em: 29 jun. 2026.